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So to anyone considering this commission, this client wants multiple 100 inch highly detailed tiles that, as written, you cannot use stock components to assist you in creation, it will have to be made from scratch to be flawlessly detailed at 100% zoom which means you really should be making these tiles twice as large to shrink down. The amount of continents are greater than the earth, so you will have to do original artwork that is on the tier of Google Maps zoom level for a world with twice as many landmasses as the earth. And not only that, without negotiation you will never get to display this art in your portfolio (that's what full rights for sole use means)... and they want it fast. I am quoting in full awareness of what this means for a project.
So my non-commercial rate for a map that's a third of the size of one of those tiles is $800, that's the average size of a big map commission though the largest map I ever did was large enough to print and lie on a gymnasium floor for a museum kid's game.
My commercial rate would make it about $2400. My exclusivity rights would make it about $8000. That's a third of one tile, so my rate for one tile with the rates above would be $24000 USD. Let's just assume for the sake of things that each continent fits on one tile and it isn't quite as high of resolution and density as the actual earth.
That would make my rate a minimum of $240,000 USD for this project if 1 continent fits on 1 tile every time, but of course it may be higher if you had the goal of more interconnected tiles.
I would of course provide a discount on this rate assuming I can display a low-res version of the art in my portfolio, and a better discount assuming I can use premade stock resources with commercial use rights to set up 3D elements like the instruments. Kitbashing would make this task notably easier, although still monumentally challenging.
I doubt such a project can be done by one artist in even a year to the quality you're requesting, and if speed is genuinely a goal it should likely be split across multiple artists.
As I cannot privately contact you until you have 5 posts or add an email, feel free to reach out to me via the contact methods in my signature or send an email to admin@feedthemultiverse.com with more information.
Best
Ti